A free program for Android, by balgan.

Tamil Write Pad App is a notepad for writing in Tamil. It has a user-friendly interface and provides auto-saved, suggestion, word-search, and an option to set the font size. 

This app can be used by both the Tamil and English speakers. You can type in either language and it will convert it to the other. There is an option to add a spell checker and also to add the words to a dictionary. There is an option to set the word-suggestion as the default suggestion. You can also add the words to a list and also to a dictionary. 

This application has a simple user interface and has no background process.